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-rw-r--r--src/Dolphin/gx/GXLight.c271
1 files changed, 271 insertions, 0 deletions
diff --git a/src/Dolphin/gx/GXLight.c b/src/Dolphin/gx/GXLight.c
new file mode 100644
index 0000000..a41b90e
--- /dev/null
+++ b/src/Dolphin/gx/GXLight.c
@@ -0,0 +1,271 @@
+#include "dolphin/gx.h"
+#include "dolphin/gx/GXPriv.h"
+
+extern float cosf(float x);
+extern float sqrtf(float x);
+
+#define GX_LARGE_NUMBER 1.0e+18f;
+
+void GXInitLightAttn(GXLightObj* lt_obj, f32 a0, f32 a1, f32 a2, f32 k0, f32 k1, f32 k2) {
+ GXLightObj_* obj = (GXLightObj_*)lt_obj;
+ obj->a0 = a0;
+ obj->a1 = a1;
+ obj->a2 = a2;
+ obj->k0 = k0;
+ obj->k1 = k1;
+ obj->k2 = k2;
+}
+
+void GXInitLightAttnA(GXLightObj* lt_obj, f32 a0, f32 a1, f32 a2) {
+ GXLightObj_* obj = (GXLightObj_*)lt_obj;
+ obj->a0 = a0;
+ obj->a1 = a1;
+ obj->a2 = a2;
+}
+
+void GXGetLightAttnA(const GXLightObj* lt_obj, f32* a0, f32* a1, f32* a2) {
+ GXLightObj_* obj = (GXLightObj_*)lt_obj;
+ *a0 = obj->a0;
+ *a1 = obj->a1;
+ *a2 = obj->a2;
+}
+
+void GXInitLightAttnK(GXLightObj* lt_obj, f32 k0, f32 k1, f32 k2) {
+ GXLightObj_* obj = (GXLightObj_*)lt_obj;
+ obj->k0 = k0;
+ obj->k1 = k1;
+ obj->k2 = k2;
+}
+
+void GXGetLightAttnK(const GXLightObj* lt_obj, f32* k0, f32* k1, f32* k2) {
+ GXLightObj_* obj = (GXLightObj_*)lt_obj;
+ *k0 = obj->k0;
+ *k1 = obj->k1;
+ *k2 = obj->k2;
+}
+
+#define PI 3.14159265358979323846F
+
+void GXInitLightSpot(GXLightObj* lt_obj, f32 cutoff, GXSpotFn spot_func) {
+ f32 a0, a1, a2, r, d, cr;
+ GXLightObj_* obj = (GXLightObj_*)lt_obj;
+
+ if (cutoff <= 0.0f || cutoff > 90.0f) {
+ spot_func = GX_SP_OFF;
+ }
+
+ r = cutoff * PI / 180.0f;
+ cr = cosf(r);
+
+ switch (spot_func) {
+ case GX_SP_FLAT:
+ a0 = -1000.0f * cr;
+ a1 = 1000.0f;
+ a2 = 0.0f;
+ break;
+ case GX_SP_COS:
+ a1 = 1.0f / (1.0f - cr);
+ a0 = -cr * a1;
+ a2 = 0.0f;
+ break;
+ case GX_SP_COS2:
+ a2 = 1.0f / (1.0f - cr);
+ a0 = 0.0f;
+ a1 = -cr * a2;
+ break;
+ case GX_SP_SHARP:
+ d = 1.0F / ((1.0F - cr) * (1.0F - cr));
+ a0 = cr * (cr - 2.0F) * d;
+ a1 = 2.0F * d;
+ a2 = -d;
+ break;
+ case GX_SP_RING1:
+ d = 1.0f / ((1.0f - cr) * (1.0F - cr));
+ a2 = -4.0f * d;
+ a0 = a2 * cr;
+ a1 = 4.0f * (1.0f + cr) * d;
+ break;
+ case GX_SP_RING2:
+ d = 1.0f / ((1.0f - cr) * (1.0F - cr));
+ a0 = 1.0f - 2.0f * cr * cr * d;
+ a1 = 4.0f * cr * d;
+ a2 = -2.0f * d;
+ break;
+ case GX_SP_OFF:
+ default:
+ a0 = 1.0f;
+ a1 = 0.0f;
+ a2 = 0.0f;
+ break;
+ }
+
+ obj->a0 = a0;
+ obj->a1 = a1;
+ obj->a2 = a2;
+}
+
+void GXInitLightDistAttn(GXLightObj* lt_obj, f32 ref_dist, f32 ref_br, GXDistAttnFn dist_func) {
+ f32 k0, k1, k2;
+ GXLightObj_* obj = (GXLightObj_*)lt_obj;
+
+ if (ref_dist < 0.0F) {
+ dist_func = GX_DA_OFF;
+ }
+
+ if (ref_br <= 0.0F || ref_br >= 1.0F) {
+ dist_func = GX_DA_OFF;
+ }
+
+ switch (dist_func) {
+ case GX_DA_GENTLE:
+ k0 = 1.0F;
+ k1 = (1.0F - ref_br) / (ref_br * ref_dist);
+ k2 = 0.0F;
+ break;
+ case GX_DA_MEDIUM:
+ k0 = 1.0f;
+ k1 = 0.5f * (1.0f - ref_br) / (ref_br * ref_dist);
+ k2 = 0.5f * (1.0f - ref_br) / (ref_br * ref_dist * ref_dist);
+ break;
+ case GX_DA_STEEP:
+ k0 = 1.0f;
+ k1 = 0.0f;
+ k2 = (1.0f - ref_br) / (ref_br * ref_dist * ref_dist);
+ break;
+ case GX_DA_OFF:
+ default:
+ k0 = 1.0f;
+ k1 = 0.0f;
+ k2 = 0.0f;
+ break;
+ }
+
+ obj->k0 = k0;
+ obj->k1 = k1;
+ obj->k2 = k2;
+}
+
+void GXInitLightPos(GXLightObj* lt_obj, f32 x, f32 y, f32 z) {
+ GXLightObj_* obj = (GXLightObj_*)lt_obj;
+
+ obj->px = x;
+ obj->py = y;
+ obj->pz = z;
+}
+
+void GXGetLightPos(const GXLightObj* lt_obj, f32* x, f32* y, f32* z) {
+ GXLightObj_* obj = (GXLightObj_*)lt_obj;
+ *x = obj->px;
+ *y = obj->py;
+ *z = obj->pz;
+}
+
+void GXInitLightDir(GXLightObj* lt_obj, f32 nx, f32 ny, f32 nz) {
+ GXLightObj_* obj = (GXLightObj_*)lt_obj;
+
+ obj->nx = -nx;
+ obj->ny = -ny;
+ obj->nz = -nz;
+}
+
+void GXGetLightDir(const GXLightObj* lt_obj, f32* nx, f32* ny, f32* nz) {
+ GXLightObj_* obj = (GXLightObj_*)lt_obj;
+ *nx = -(obj->nx);
+ *ny = -(obj->ny);
+ *nz = -(obj->nz);
+}
+
+void GXInitSpecularDir(GXLightObj* lt_obj, f32 nx, f32 ny, f32 nz) {
+ f32 mag;
+ f32 vx, vy, vz;
+ GXLightObj_* obj = (GXLightObj_*)lt_obj;
+
+ vx = -nx;
+ vy = -ny;
+ vz = (-nz + 1.0F);
+ mag = vx * vx + vy * vy + vz * vz;
+
+ if (mag != 0.0f) {
+ mag = 1.0f / sqrtf(mag);
+ }
+
+ obj->px = vx * mag;
+ obj->py = vy * mag;
+ obj->pz = vz * mag;
+
+ obj->nx = nx * -GX_LARGE_NUMBER;
+ obj->ny = ny * -GX_LARGE_NUMBER;
+ obj->nz = nz * -GX_LARGE_NUMBER;
+}
+
+void GXInitSpecularDirHA(GXLightObj* lt_obj, f32 nx, f32 ny, f32 nz, f32 hx, f32 hy, f32 hz) {
+ GXLightObj_* obj = (GXLightObj_*)lt_obj;
+
+ obj->nx = hx;
+ obj->ny = hy;
+ obj->nz = hz;
+
+ obj->px = nx * -GX_LARGE_NUMBER;
+ obj->py = ny * -GX_LARGE_NUMBER;
+ obj->pz = nz * -GX_LARGE_NUMBER;
+}
+
+void GXInitLightColor(GXLightObj* lt_obj, GXColor color) {
+ GXLightObj_* obj = (GXLightObj_*)lt_obj;
+ obj->color = *(u32*)(&color);
+}
+
+void GXGetLightColor(const GXLightObj* lt_obj, GXColor* color) {
+ GXLightObj_* obj = (GXLightObj_*)lt_obj;
+ *(u32*)color = obj->color;
+}
+
+static inline void PushLight(const register GXLightObj_* lt_obj, register void* dest) {
+ register u32 zero, color;
+ register f32 a0_a1, a2_k0, k1_k2;
+ register f32 px_py, pz_dx, dy_dz;
+
+ asm
+ {
+ lwz color, 12(lt_obj)
+ xor zero, zero, zero
+ psq_l a0_a1, 16(lt_obj), 0, 0
+ psq_l a2_k0, 24(lt_obj), 0, 0
+ psq_l k1_k2, 32(lt_obj), 0, 0
+ psq_l px_py, 40(lt_obj), 0, 0
+ psq_l pz_dx, 48(lt_obj), 0, 0
+ psq_l dy_dz, 56(lt_obj), 0, 0
+
+ stw zero, 0(dest)
+ stw zero, 0(dest)
+ stw zero, 0(dest)
+ stw color, 0(dest)
+ psq_st a0_a1, 0(dest), 0, 0
+ psq_st a2_k0, 0(dest), 0, 0
+ psq_st k1_k2, 0(dest), 0, 0
+ psq_st px_py, 0(dest), 0, 0
+ psq_st pz_dx, 0(dest), 0, 0
+ psq_st dy_dz, 0(dest), 0, 0
+ }
+}
+
+void GXLoadLightObjImm(GXLightObj* lt_obj, GXLightID light) {
+ u32 addr;
+ u32 idx;
+ GXLightObj_* obj;
+ obj = (GXLightObj_*)lt_obj;
+
+ idx = 31 - __cntlzw(light);
+ idx &= 7;
+
+ addr = XF_LIGHT_BASE + idx * XF_LIGHT_SIZE;
+
+ GX_WRITE_U8(16);
+ GX_WRITE_U32(addr | (XF_LIGHT_SIZE - 1) << 16);
+ PushLight(obj, (void*)GX_FIFO_ADDR);
+ __GXData->cpCRreg = 1;
+}
+
+void GXSetChanAmbColor(GXChannelID chan, GXColor color) {
+
+}
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